Judge finds limit to Trump ability to block witnesses from House

05:20

Barbara McQuade, former U.S. attorney, talks with Rachel Maddow about the dramatic ruling by U.S. District Judge Ketanji Brown Jackson in which she explains that presidents are not kings and even Donald Trump is not above the law, so former White House counsel Don McGahn cannot ignore a subpoena to testify before the House impeachment inquiry just because Trump doesn't want him to.